CN112743258A - End face welding agent for zinc oxide resistance card - Google Patents
End face welding agent for zinc oxide resistance card Download PDFInfo
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- CN112743258A CN112743258A CN202011506935.9A CN202011506935A CN112743258A CN 112743258 A CN112743258 A CN 112743258A CN 202011506935 A CN202011506935 A CN 202011506935A CN 112743258 A CN112743258 A CN 112743258A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/105—Varistor cores
- H01C7/108—Metal oxide
- H01C7/112—ZnO type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3612—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with organic compounds as principal constituents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the field of welding aids, in particular to a zinc oxide resistor disc end face welding agent which comprises the following components in parts by weight: 20-30 parts of polyaniline nano-fiber, 100-180 parts of organic solvent, 20-25 parts of conductive inorganic non-metallic filler, 20-25 parts of conductive metal filler, 100-150 parts of thermosetting resin, 10-60 parts of curing agent and 5-30 parts of accelerator. According to the invention, by utilizing the synergistic effect between the polyaniline nanofibers and the graphene, the graphene can provide a conductive framework for the polyaniline nanofibers, and the polyaniline can improve the stability of the graphene; the thermosetting resin has good processability, is easy to be mixed with a curing agent, a conductive filler and the like, so that the conductive filler is uniformly distributed in the welding agent and is tightly attached to the surface of the aluminum layer of the resistance card after being cured, and the aluminum layer on the resistance surface is protected; the welding agent has good conductive capability, strong adhesiveness, good chemical stability and better mechanical property.
Description
Technical Field
The invention relates to the field of welding aids, in particular to a zinc oxide resistor disc end face welding agent.
Background
In recent years, due to the continuous development of the manufacturing technology of the lightning arrester, the international standard has higher and higher requirements on the electrical performance of the zinc oxide lightning arrester. The zinc oxide resistance card is used as a core component of the lightning arrester, and the flatness of the end surface of the zinc oxide resistance card can directly influence the effective contact surface between the zinc oxide resistance cards, so that the level and the current capacity of the zinc oxide lightning arrester for withstanding lightning surge are influenced.
In the daily test process of the zinc oxide lightning arrester, faults such as flashover, thermal breakdown and the like of a plurality of lightning arresters in residual voltage or large current test are often found, a large gap is found between contact surfaces of the resistance cards after dissection, and the part where the flashover or the thermal breakdown occurs is located at the gap. Gaps between contact surfaces of the resistance sheets can cause corona phenomena and excessive partial discharge, the corona phenomena are ionization phenomena of surrounding air under the action of a strong electric field, the corona discharge can cause electrochemical reaction of gas in the air, corrosive gases such as ozone and nitrogen oxide are generated, corrosion of aluminum layers on the surfaces of zinc oxide resistance products is caused, and the lightning impulse resistance performance of the lightning arrester is further influenced. Corona discharge can also generate high-frequency pulse current, can be accompanied by the generation of electric pulse, ultrasonic wave, electromagnetic radiation, light, chemical reaction, and cause local heating and other phenomena, wherein the contained higher harmonics can interfere radio communication, and some lightning arresters used in ultrahigh voltage and some specific occasions have to be subjected to corona test, and the prior art is difficult to meet the requirements. The strong partial discharge will cause the lightning arrester to decrease its insulation strength rapidly. This is an important factor in causing insulation damage of high-voltage electric power equipment. Therefore, when designing the insulation of high-voltage power equipment, it is considered that the insulation structure is not allowed to generate strong partial discharge under the action of long-term working voltage, and when the partial discharge exceeds a certain degree, the equipment needs to be taken out of operation for maintenance or replacement.
Although the existing conductive adhesive can be used for simply realizing seamless connection between resistance cards, the stability is poor, the impact force and heat generated in the lightning impulse process of the lightning arrester are difficult to bear, and the conductive adhesive is not corrosion-resistant and high-temperature-resistant, has fatal influence on various parameters of the lightning arrester, and cannot be used. At present, conductive metals such as lead skins and corrugated sheets are added among zinc oxide resistance sheets by a plurality of manufacturers to achieve full contact of the sheets, but the deformable quantity of the conductive metals is limited, and although the fault probability of the zinc oxide arrester in normal operation can be reduced by reducing gaps among contact surfaces of the zinc oxide resistance sheets, the problem cannot be solved fundamentally, the seamless connection of the zinc oxide resistance sheets cannot be achieved, the cost of the conductive metals is high (the lead skins are toxic and are strictly forbidden in many countries), and a large amount of experimental data show that the conductive metals have certain influence on the electrical performance of the whole arrester, and an aluminum layer between the contact surfaces of the resistance sheets is easy to be corroded by damp.
Therefore, it is necessary to provide a new material which can withstand lightning surge and realize seamless connection between zinc oxide resistor sheets.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the welding agent for the end face of the zinc oxide resistance card, which has low cost and can bear lightning impulse, and the electric performance parameters of the zinc oxide resistance card and the through-flow and heat-conducting capacity of the resistance card are not influenced while the seamless connection between the zinc oxide resistance cards is realized.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the welding agent for the end face of the zinc oxide resistance chip comprises the following components in parts by weight: 20-30 parts of polyaniline nano-fiber, 100-180 parts of organic solvent, 20-25 parts of conductive inorganic non-metallic filler, 20-25 parts of conductive metal filler, 100-150 parts of thermosetting resin, 10-60 parts of curing agent and 5-30 parts of accelerator.
The preparation method of the welding agent for the end face of the zinc oxide resistance chip comprises the following steps:
(1) dissolving polyaniline nanofibers in an organic solvent at the temperature of 60-80 ℃, and stirring to fully mix the polyaniline nanofibers and the organic solvent to obtain a polyaniline nanofiber organic solution S1; adding conductive inorganic non-metal filler and conductive metal filler into the organic solution S1 and stirring to prepare an organic solution S2;
(2) mixing the organic solution S2 and thermosetting resin, and adding the mixture into a nano grinder at the temperature of 60-80 ℃ to prepare a mixed solution S3; wherein the linear velocity of the stirring rotor of the nano-mill is not lower than 12.5 m/sec; the granularity D50 of the slurry in the mixed solution after grinding is not more than 0.6 mu m; slurry particle size D97: not more than 0.8 μm;
(3) placing the mixed solution S3 in a vacuum drying oven at the temperature of 60-80 ℃ for vacuum degassing, placing in an oven at the temperature of 120-160 ℃ after degassing, and fully crosslinking the components until the solution becomes a blocky solid; crushing the massive solid, and filtering the crushed massive solid by using a 100-mesh screen to prepare welding agent powder;
(4) and dissolving the welding agent powder in an organic solvent to prepare a mixed solution S4, and fully stirring and mixing the mixed solution S4, a curing agent and an accelerant to prepare the end face welding agent for the zinc oxide resistance card.
Preferably, in the step (1), the mass ratio of the polyaniline nanofibers to the organic solvent is 1: (2-5); the organic solvent is styrene.
Preferably, in the step (1), the mass ratio of the conductive inorganic non-metal filler to the conductive metal filler to the organic solution S1 is (0.5-3): (0.5-3): 4; the conductive inorganic non-metallic filler is one or more of graphite powder, carbon black, graphene, carbon fiber and carbon nano tube; the conductive metal filler is one or more of conductive silver powder, gold powder, copper powder, aluminum powder, nickel powder and aluminum powder.
Preferably, in step (1), the polyaniline nanofibers are prepared by:
(1) respectively dissolving 4 parts of aniline monomer and 10 parts of ammonium sulfate serving as an oxidant in 60 parts of hydrochloric acid with the mass percent of 5-50% to respectively prepare an aniline solution and an oxidant solution; mixing the aniline solution and the oxidant solution for 0.5-8 hours under the conditions that the ultrasonic frequency is 20 kHz-1 MHz and the temperature is 10-30 ℃ to prepare a dispersion liquid of the polyaniline nanofiber;
(2) filtering and washing the dispersion liquid, removing water-soluble impurities, and drying at 40-50 ℃ to obtain the conductive polyaniline nano-fiber; dissolving the polyaniline nano-fiber in 2-10% ammonia water by mass for 0.2-1.5 h, filtering and washing after the reaction is finished until the filtrate is neutral, and drying at 40-50 ℃ to obtain the intrinsic polyaniline nano-fiber; wherein the pH value of the polyaniline nanofibers and ammonia water is 8-10;
(3) and mixing and stirring 100 parts of the eigenstate polyaniline nanofiber and 60 parts of hydrochloric acid solution with the concentration of 1.5mol/dm3 for 2-8 hours, and then sequentially filtering, drying and grinding to obtain the conductive polyaniline nanofiber.
Preferably, in the step (2), the mass ratio of the thermosetting resin to the organic solution S2 is 1: (0.5-5), wherein the thermosetting resin is one or more of phenolic resin, epoxy resin and vinyl ester resin.
Preferably, in the step (4), the mass ratio of the solder powder to the organic solvent is (2-5): 1.
preferably, in the step (4), the mass ratio of the mixed solution S4 to the curing agent to the accelerator is (0.5-3): (0.5-3): 0.5; the curing agent is one or more of aliphatic amine, aromatic amine, polyamide and amidoamine; the accelerator is a fatty amine accelerator or an acid anhydride accelerator.
The application method of the end face welding agent of the zinc oxide resistance card comprises the steps of uniformly coating the end face welding agent between contact surfaces of the resistance card, and then curing at high temperature; wherein the curing temperature is controlled at 100 ℃ for 5h, 130 ℃ for 3h and 180 ℃ for 2 h.
(III) advantageous effects
The invention provides a zinc oxide resistor disc end face welding agent which has the following beneficial effects:
(1) the polyaniline nanofiber and the conductive filler enable the welding agent to have excellent capabilities of electric conduction, heat conduction, lightning impulse resistance and the like; the graphite is one of materials with the highest known strength and has good conductivity, the graphene can provide a conductive framework for the polyaniline nanofiber by utilizing the synergistic effect between the polyaniline nanofiber and the graphene, the polyaniline can improve the stability of the graphene, the polyaniline and the graphene are matched with each other, the high-temperature resistance, the impact resistance and the high conductive efficiency can be realized, and the conductive metal filler aluminum powder can be closely matched with an aluminum layer on the surface of the resistance card; the thermosetting resin (epoxy resin) has good processability, is easy to mix with a curing agent, a conductive filler and the like, enables the conductive filler to be uniformly distributed in the welding agent, and is tightly attached to the surface of the resistance sheet aluminum layer after being cured, so that the resistance surface aluminum layer is protected, and the thermosetting resin (epoxy resin) has good conductive capability, strong adhesiveness, good chemical stability and good mechanical property, so that the electrical property parameters of the resistance sheet are more stable.
(2) When the lightning arrester is subjected to lightning impact, the welding agent can enable the contact surface of the resistance card to uniformly pass through overcurrent and heat generated in the impact process, reduce the probability of thermal breakdown caused by overlarge local overcurrent or overhigh local heat of the resistance card, and essentially solve the problem of faults of the zinc oxide lightning arrester in line operation caused by contact of gaps between the end surfaces of the zinc oxide resistance card; the end face welding agent enables the whole lightning arrester to realize two times of damage-free large current of 110kA, and reaches the domestic advanced level.
(3) The welding agent is convenient to use and transport and store, welding agent powder, the curing agent and the accelerator can be stored separately, and the welding agent with good performance can be obtained by fully mixing the welding agent powder, the curing agent and the accelerator during use.
(4) According to the invention, a special high-temperature curing curve is adopted for curing (100 ℃ for 5h, 130 ℃ for 3h and 180 ℃ for 2h), so that not only can the full crosslinking reaction between the components of the welding agent be realized, the welding agent can bear 150KA large current impact, but also the parameters of the whole zinc oxide resistance card cured by the temperature curve are more stable.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example 1
The welding agent for the end face of the zinc oxide resistance chip comprises the following components in parts by weight: 25 parts of polyaniline nano-fiber, 100 parts of organic solvent, 25 parts of conductive inorganic non-metallic filler, 25 parts of conductive metal filler, 100 parts of thermosetting resin, 30 parts of curing agent and 6 parts of accelerator.
The preparation method of the zinc oxide resistance card end face welding agent comprises the following steps:
(1) at 70 ℃, dissolving the polyaniline nano-fiber in styrene and stirring to fully mix the polyaniline nano-fiber and the styrene to prepare polyaniline nano-fiber organic solution S1; adding graphene and aluminum powder into the organic solution S1 and stirring to obtain an organic solution S2;
(2) mixing the organic solution S2 and bisphenol A glycidyl ether type epoxy resin, and adding the mixture into a nano grinder at the temperature of 60-80 ℃ to prepare a mixed solution S3; wherein the linear velocity of the stirring rotor of the nano-mill is not lower than 12.5 m/sec; the granularity D50 of the slurry in the mixed solution after grinding is not more than 0.6 mu m; slurry particle size D97: not more than 0.8 μm;
(3) placing the mixed solution S3 in a vacuum drying oven at the temperature of 60-80 ℃ for vacuum degassing, placing in an oven at the temperature of 120-160 ℃ after degassing, and fully crosslinking the components until the solution becomes a blocky solid; crushing the massive solid, and filtering the crushed massive solid by using a 100-mesh screen to prepare welding agent powder;
(4) and dissolving the welding agent powder into styrene to prepare a mixed solution S4, and fully stirring and mixing the mixed solution S4, 650 parts of polyamide and aliphatic amine (DMP-30) to prepare the welding agent for the end face of the zinc oxide resistance card.
Example 2
The welding agent for the end face of the zinc oxide resistance chip comprises the following components in parts by weight: 20-30 parts of polyaniline nano-fiber, 100-180 parts of organic solvent, 20-25 parts of conductive inorganic non-metallic filler, 20-25 parts of conductive metal filler, 100-150 parts of thermosetting resin, 10-60 parts of curing agent and 5-6 parts of accelerator.
The preparation method of the zinc oxide resistance card end face welding agent comprises the following steps:
(1) dissolving polyaniline nanofiber in styrene at 60-80 ℃, and stirring to fully mix the polyaniline nanofiber and the styrene to prepare polyaniline nanofiber organic solution S1; adding graphene and aluminum powder into the organic solution S1 and stirring to obtain an organic solution S2; the mass ratio of the polyaniline nanofibers to the styrene is 1: 3; the mass ratio of the graphene to the aluminum powder to the organic solution S1 is 1: 1: 4;
(2) mixing the organic solution S2 and bisphenol A glycidyl ether type epoxy resin, and adding the mixture into a nano grinder at the temperature of 60-80 ℃ to prepare a mixed solution S3; wherein the linear velocity of the stirring rotor of the nano-mill is not lower than 12.5 m/sec; the granularity D50 of the slurry in the mixed solution after grinding is not more than 0.6 mu m; slurry particle size D97: not more than 0.8 μm; the mass ratio of the bisphenol A glycidyl ether type epoxy resin to the organic solution S2 is 1: 1;
(3) placing the mixed solution S3 in a vacuum drying oven at the temperature of 60-80 ℃ for vacuum degassing, placing in an oven at the temperature of 120-160 ℃ after degassing, and fully crosslinking the components until the solution becomes a blocky solid; crushing the massive solid, and filtering the crushed massive solid by using a 100-mesh screen to prepare welding agent powder;
(4) dissolving the welding agent powder into styrene to prepare a mixed solution S4, and fully stirring and mixing the mixed solution S4, 650 polyamide and aliphatic amine (DMP-30) to prepare the welding agent for the end face of the zinc oxide resistance card; the mass ratio of the solder powder to the styrene is 4: 1; the mass ratio of the mixed solution S4, 650 polyamide and fatty amine (DMP-30) is 1: 1: 0.5.
the polyaniline nanofiber is prepared by the following steps:
(1) respectively dissolving 4 parts of aniline monomer and 10 parts of ammonium sulfate serving as an oxidant in 60 parts of hydrochloric acid with the mass percent of 5-50% to respectively prepare an aniline solution and an oxidant solution; mixing the aniline solution and the oxidant solution for 0.5-8 hours under the conditions that the ultrasonic frequency is 20 kHz-1 MHz and the temperature is 10-30 ℃ to prepare a dispersion liquid of the polyaniline nanofiber;
(2) filtering and washing the dispersion liquid, removing water-soluble impurities, and drying at 40-50 ℃ to obtain the conductive polyaniline nano-fiber; dissolving the polyaniline nano-fiber in 2-10% ammonia water by mass for 0.2-1.5 h, filtering and washing after the reaction is finished until the filtrate is neutral, and drying at 40-50 ℃ to obtain the intrinsic polyaniline nano-fiber; wherein the pH value of the polyaniline nanofibers and ammonia water is 8-10;
(3) 100 parts and 60 parts of the intrinsic polyaniline nano-fiber with the concentration of 1.5mol/dm3And mixing and stirring the hydrochloric acid solution for 2-8 hours, and then sequentially filtering, drying and grinding to obtain the conductive polyaniline nano-fiber.
The application method of the end face welding agent of the zinc oxide resistance card comprises the steps of uniformly coating the end face welding agent between contact surfaces of the resistance card, and then curing at high temperature; wherein the curing temperature is controlled at 100 ℃ for 5h, 130 ℃ for 3h and 180 ℃ for 2 h.
The instrument equipment such as a Field Emission Scanning Electron Microscope (FESEM), a high-resolution transmission electron microscope (HRTEM), X-ray powder diffraction (XRD) and the like can be used for clearly showing that: the welding agent prepared by the method can be well attached to the end face of the zinc oxide resistance card.
The bonded resistance chip is qualified after being subjected to various electrical property parameter tests, and the welding agent is subjected to lightning impulse test, thermal conductivity test, thermal decomposition temperature test, volume resistivity test and surface resistance test respectively, wherein the lightning impulse can resist 150KA of large current, the thermal conductivity is 3.0W/m.k, the resistivity is 1.7 multiplied by 10-3Omega/cm, surface resistance of 1.3 omega, thermal decomposition temperature up to 512 ℃ decomposition 3%. The result shows that the welding agent prepared by the invention has good heat-conducting property, small conductive resistance and good high-temperature resistance and lightning impulse resistance.
The welding agent is low in cost, convenient to use, convenient to store and transport, pollution-free, and capable of tolerating lightning impulse, the electrical performance parameters of the zinc oxide resistance pieces and the through-flow and heat conduction capacity of the zinc oxide resistance pieces are not affected when seamless connection between the zinc oxide resistance pieces is achieved, and the capacity of tolerating the lightning impulse of the whole lightning arrester is improved to a great extent.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The welding agent for the end face of the zinc oxide resistance chip is characterized by comprising the following components in parts by weight: 20-30 parts of polyaniline nano-fiber, 100-180 parts of organic solvent, 20-25 parts of conductive inorganic non-metallic filler, 20-25 parts of conductive metal filler, 100-150 parts of thermosetting resin, 10-60 parts of curing agent and 5-30 parts of accelerator.
2. The preparation method of the end face welding agent for the zinc oxide resistor disc as claimed in claim 1, characterized by comprising the following steps:
(1) dissolving polyaniline nanofibers in an organic solvent at the temperature of 60-80 ℃, and stirring to fully mix the polyaniline nanofibers and the organic solvent to obtain a polyaniline nanofiber organic solution S1; adding conductive inorganic non-metal filler and conductive metal filler into the organic solution S1 and stirring to prepare an organic solution S2;
(2) mixing the organic solution S2 and thermosetting resin, and adding the mixture into a nano grinder at the temperature of 60-80 ℃ to prepare a mixed solution S3; wherein the linear velocity of the stirring rotor of the nano-mill is not lower than 12.5 m/sec; the granularity D50 of the slurry in the mixed solution after grinding is not more than 0.6 mu m; slurry particle size D97: not more than 0.8 μm;
(3) placing the mixed solution S3 in a vacuum drying oven at the temperature of 60-80 ℃ for vacuum degassing, placing in an oven at the temperature of 120-160 ℃ after degassing, and fully crosslinking the components until the solution becomes a blocky solid; crushing the massive solid, and filtering the crushed massive solid by using a 100-mesh screen to prepare welding agent powder;
(4) and dissolving the welding agent powder in an organic solvent to prepare a mixed solution S4, and fully stirring and mixing the mixed solution S4, a curing agent and an accelerant to prepare the end face welding agent for the zinc oxide resistance card.
3. The preparation method of the end face welding agent for the zinc oxide resistor disc as claimed in claim 2, wherein in the step (1), the mass ratio of the polyaniline nanofibers to the organic solvent is 1: (2-5); the organic solvent is styrene.
4. The preparation method of the end face welding agent for the zinc oxide resistor disc as claimed in claim 2, wherein in the step (1), the mass ratio of the conductive inorganic non-metal filler to the conductive metal filler to the organic solution S1 is (0.5-3): (0.5-3): 4; the conductive inorganic non-metallic filler is one or more of graphite powder, carbon black, graphene, carbon fiber and carbon nano tube; the conductive metal filler is one or more of conductive silver powder, gold powder, copper powder, aluminum powder, nickel powder and aluminum powder.
5. The preparation method of the end face welding agent for the zinc oxide resistor disc as claimed in claim 3, wherein in the step (1), the polyaniline nanofiber is prepared by the following steps:
(1) respectively dissolving 4 parts of aniline monomer and 10 parts of ammonium sulfate serving as an oxidant in 60 parts of hydrochloric acid with the mass percent of 5-50% to respectively prepare an aniline solution and an oxidant solution; mixing the aniline solution and the oxidant solution for 0.5-8 hours under the conditions that the ultrasonic frequency is 20 kHz-1 MHz and the temperature is 10-30 ℃ to prepare a dispersion liquid of the polyaniline nanofiber;
(2) filtering and washing the dispersion liquid, removing water-soluble impurities, and drying at 40-50 ℃ to obtain the conductive polyaniline nano-fiber; dissolving the polyaniline nano-fiber in 2-10% ammonia water by mass for 0.2-1.5 h, filtering and washing after the reaction is finished until the filtrate is neutral, and drying at 40-50 ℃ to obtain the intrinsic polyaniline nano-fiber; wherein the pH value of the polyaniline nanofibers and ammonia water is 8-10;
(3) 100 parts and 60 parts of the intrinsic polyaniline nano-fiber with the concentration of 1.5mol/dm3Mixing and stirring the hydrochloric acid solution for 2-8 h, and then sequentially filteringDrying and grinding to obtain the conductive polyaniline nano-fiber.
6. The method for preparing the end face welding agent for the zinc oxide resistor disc as claimed in claim 2, wherein in the step (2), the mass ratio of the thermosetting resin to the organic solution S2 is 1: (0.5-5), wherein the thermosetting resin is one or more of phenolic resin, epoxy resin and vinyl ester resin.
7. An end face welding agent for a zinc oxide resistor disc according to claim 2, wherein in the step (4), the mass ratio of the welding agent powder to the organic solvent is (2-5): 1.
8. the end face welding agent for zinc oxide resistance cards according to claim 2, wherein in the step (4), the mass ratio of the mixed solution S4, the curing agent and the accelerator is (0.5-3): (0.5-3): 0.5; the curing agent is one or more of aliphatic amine, aromatic amine, polyamide and amidoamine; the accelerator is a fatty amine accelerator or an acid anhydride accelerator.
9. A method for using the end face welding agent of the zinc oxide resistor disc as claimed in any one of claims 2-8, characterized in that the end face welding agent is uniformly coated between contact surfaces of the resistor disc and then cured at high temperature; wherein the curing temperature is controlled at 100 ℃ for 5h, 130 ℃ for 3h and 180 ℃ for 2 h.
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| CN115101709A (en) * | 2022-06-29 | 2022-09-23 | 江苏正力新能电池技术有限公司 | Glue for battery tab, preparation method of glue and multi-tab battery cell |
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| CN1786304A (en) * | 2005-12-05 | 2006-06-14 | 西安交通大学 | Preparation method of conductive polymer polyanilinc nano fiber |
| CN103665511A (en) * | 2012-09-26 | 2014-03-26 | 乐天化学株式会社 | Conductive resin composition |
| CN104099683A (en) * | 2013-04-12 | 2014-10-15 | 中国石油化工股份有限公司 | Polymer/conductive filler/metal composite fiber and preparation method thereof |
| CN103694877A (en) * | 2013-12-17 | 2014-04-02 | 西安华捷科技发展有限责任公司 | Efficient nanofiber solar energy absorption composite membrane as well as preparing and spraying method thereof |
| US20170200527A1 (en) * | 2014-07-22 | 2017-07-13 | Alpha Assembly Solutions Inc. | Stretchable Interconnects for Flexible Electronic Surfaces |
| CN108373746A (en) * | 2016-11-17 | 2018-08-07 | 中国科学院宁波材料技术与工程研究所 | Graphene epoxy composite anticorrosive paint, preparation method and application |
| CN209544048U (en) * | 2019-02-27 | 2019-10-25 | 江苏神马电力股份有限公司 | A kind of arrester |
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| CN115101709A (en) * | 2022-06-29 | 2022-09-23 | 江苏正力新能电池技术有限公司 | Glue for battery tab, preparation method of glue and multi-tab battery cell |
| CN115101709B (en) * | 2022-06-29 | 2024-04-09 | 江苏正力新能电池技术有限公司 | Gluing for battery lugs, preparation method of gluing and multi-lug battery core |
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